This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement SAUJ40X300-30S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAU replacement uses the same profile body, bore, stroke, force and SC-series mounting. It moves to the current CMSG / DMSG / EMSG sensor switches (the SU used CS1-B / DS1-B) and adds the SAUF valve-integrated option.
Airtac SUJ Adjustable Cylinder SUJ40X300-30S
The AirTAC SUJ Adjustable Cylinder SUJ40X300-30S is a double-acting profile-type standard cylinder with a Ø40mm bore and 300mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAUJ40X300-30S, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke300 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAUJ40X300-30S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SUJ Adjustable Cylinder SUJ40X300-30S
The AirTAC SUJ40X300-30S is a double-acting, double-rod profile cylinder with a 40 mm bore and a 300 mm nominal stroke. An external stop screw allows you to trim the extend stroke by up to 30 mm on-site, yielding a usable extend window of 270 to 300 mm. It features a 1/4" port, an M12x1.25 rod thread, and 21 mm adjustable air cushions at each end.
This SUJ model is discontinued and the direct replacement is the SAUJ40X300-30S, which retains the same bore, stroke, force, port, and FA/LB mounting. The -S suffix denotes a built-in piston magnet for position sensing; this legacy unit used CS1-B/DS1-B switches, whereas the current SAUJ uses CMSG/DMSG/EMSG sensors. The stop screw sets the end position but is not a load lock; external air is required to hold position.
Airtac SUJ Adjustable Cylinder SUJ40X300-30S Technical Specifications
| Model | Airtac SUJ Adjustable Cylinder SUJ40X300-30S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | SAUJ40X300-30S |
| Bore size | Ø40 mm |
| Stroke | 300 mm |
| Acting type | Double acting |
| Port size | 1/4" |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SU datasheet (now discontinued). The SAUJ40X300-30S carries the same ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAUJ40X300-30S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SUJ Adjustable Cylinder SUJ40X300-30S
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SU-family variants: SUD (double rod), SUJ (adjustable stroke) — each maps to its SAU equivalent (SUD→SAUD, SUJ→SAUJ). The current SAU line adds the SAUF valve-integrated option.
Where the Airtac SUJ Adjustable Cylinder SUJ40X300-30S Is Used
Variable Depth Boring
Dial in precise extend stops for boring operations where material thickness varies, using the 30 mm on-site stroke trim to set exact depths without reprogramming the motion controller.
Adjustable Diverter Arm
Tune the extend reach of a diverter gate on a packaging line to accommodate different carton widths, adjusting the stroke window from 270 to 300 mm as needed.
Variable Height Stops
Position pallets at varying distances from a workstation by trimming the extend stroke on the fly, allowing flexible floor layouts without changing the cylinder body.
Replacing the Airtac SUJ Adjustable Cylinder SUJ40X300-30S with the SAUJ40X300-30S
To replace the discontinued SUJ40X300-30S, order the direct replacement SAUJ40X300-30S, ensuring you migrate your position sensing from legacy CS1-B/DS1-B to current CMSG/DMSG/EMSG switches. The 30 mm adjust window is ideal for dialing in the exact extend end position without machining hard stops. Mounting remains compatible with AirTAC SC series FA and LB brackets. Because the stroke is 300 mm, implement external guides to prevent rod bending and manage side loads. The stop screw merely sets the end position; it does not lock the load, so use an external rod lock for held loads.
Replacement checklist
- ✓ Same bore / stroke → SAUJ40X300-30S
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S): sensor family CS1-B → CMSG
- ✓ Mounting reused (FA/FB/CA/CB/LB)
- ✓ Need a built-in valve? → SAUF
Airtac SUJ Adjustable Cylinder SUJ40X300-30S FAQ
Yes, the SUJ40X300-30S is discontinued. The direct replacement is the SAUJ40X300-30S, which matches the 40 mm bore, 300 mm stroke, 1/4" port, and FA/LB mounting. You must upgrade the position sensors from legacy CS1-B/DS1-B to current CMSG/DMSG/EMSG switches.
The external stop screw provides a 30 mm adjust window, shortening the extend stroke from the 300 mm maximum down to 270 mm on-site. The stop sets end position and is not a load lock.
Related AirTAC SAU Cylinders
Request a Quote for the SAUJ40X300-30S
Send us the quantity and destination. We confirm price, stock and lead time on the SAUJ40X300-30S replacement — usually within 7-8 hours.